If you're installing halogen fixtures then it's guaranteed your going back to replace lamps. The halogen system is pretty unreliable if you think about it. Everyone expects the halogen to fail and they're only a few dollars to replace. If the LED lamp fails before it's time though then this is very bad because they're quite a bit more. More importantly the reputation of the individual who selected the lamp is tarnished or worse. The burden of lamp selection falls on the specifier/installer along with the responsibility and accountability of ensuring it's up to the task. How will you know when or if LED lamp technology is ready? I think it would be best to say what you want and expect from this technology. I see a lot of feedback on the transformer thread (can I get a 100Watt by the way with all the bells and whistles please especially the LED light inside) I just got the latest issue of Architectural SSL and every time there are more companies involved and lots of discussion as to how this technology should be handled. Architects and specifiers are definitely providing there feedback, good and bad. There are good examples of LED specific fixtures too like Cree's LR6 downlight, it's won awards and I haven't heard anything negative about this fixture since it's release a few years ago. There's an article about Zumtobel's redesigned Aero lamp using LED technology. I think Zumtobel is a reputable company concerned with their reputation and I also think they took the time to do it right. If you're going to say LED lamps are no good then you should say why. Like I measured the heatsink of brand X and it was over 200F at room temperature or there are 4 LED chips off center in relation to the reflector so how can that be the most efficient design. If you don't know the questions to ask or what to look for how will you know when you can use it?